我试图用来EKCalendarChooser获取用户选择的多个日历。这就是我呈现观点的方式：
EKCalendarChooser* dvc= [[[EKCalendarChooser alloc] initWithSelectionStyle:EKCalendarChooserSelectionStyleMultiple displayStyle:EKCalendarChooserDisplayAllCalendars eventStore:eventStore] autorelease];
dvc.selectedCalendars= self.selectedCalendars;
dvc.delegate= self;
dvc.contentSizeForViewInPopover= CGSizeMake(320.0, 480.0);
self.popOver= [[UIPopoverController alloc] initWithContentViewController:dvc];
[self.popOver release];
self.popOver.delegate= self;
UIBarButtonItem* item= sender;
[self.popOver presentPopoverFromBarButtonItem:item permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
一旦我选择了一个或多个日历，我就会收到calendarChooserSelectionDidChange消息，但每次 selectedCalendars 的属性EKCalendarChooser都是空的！
- (void)calendarChooserSelectionDidChange:(EKCalendarChooser *)calendarChooser
{
NSLog(@"selected %d calendars", calendarChooser.selectedCalendars.count);
}
2012-02-26 12:50:39.137 MyApp[8604:707] selected 0 calendars
2012-02-26 12:50:42.100 MyApp[8604:707] selected 0 calendars
当我使用EKCalendarChooserSelectionStyleSingle而不是EKCalendarChooserSelectionStyleMultiple，一切正常，我将通过 selectedCalendars 属性获得正确的选定日历。
我做错了什么，还是这是一个错误EKCalendarChooser？